from flask import render_template, current_app, abort, request, jsonify, g

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route("/comment_like", methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户没登录")

    # 1.取到请求参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    if not all([comment_id,news_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ({"add", "remove"}):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")


    try:
        comment = Comment.query.get(comment_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")


    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")


    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment.id).first()


        # 判断点赞评论是否存在，不存在情况下再点赞评论
        if not comment_like_model:
            # 点赞评论
             comment_like_model = CommentLike()
             comment_like_model.user_id = user.id
             comment_like_model.comment_id = comment.id

             db.session.add(comment_like_model)

    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:

        db.session.commit()
    except Exception as e:
        db.session.rollbck()
        current_app.logger.error(e)

    return jsonify(errno=RET.OK, errmsg="ok")




@news_blu.route("/news_comment", methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户没登录")

    # 1.取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")


    # 2. 判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 3. 初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 为什么要自己去commit()?因为在return的时候需要用到comment的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg="操作成功", data=comment.to_dict())

@news_blu.route("/news_collect", methods=["POST"])
@user_login_data
def collect_news():
    """
    收藏新闻
    1.接受参数
    2.判断参数
    3.查询新闻，并判断新闻是否存在

    :return:
    """
    user = g.user

    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户没登录")


    # 1.接受参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")


    # 2.判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["collect", "cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")


    # 3.查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")


    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 4.收藏以及取消收藏
    if action == "cancel_collect":
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)

    else:
        # 收藏
        if news not in user.collection_news:
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg="操作成功")

@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """

    # 查询用户登录信息
    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 定义一个空的字典列表，里面装的就是字典
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())


    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)

    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)

    # 更新新闻的点击次数
    news.clicks += 1

    # 是否是收藏
    is_collected = False

    # if 用户已经登录：
    #      判断用户是否收藏当前新闻，如果收藏
    #           is_collected = True

    if user:
        # 判断用户是否收藏当前新闻  如果收藏：
        # collection_news
        if news in user.collection_news:
            is_collected = True


    # 去查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id==news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)


    comment_like_ids = []
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里都点赞了哪些评论

            # 1. 查询出当前新闻的所有评论（[COMMENT]）  取到所有的评论id  比如：[1,2,3,4,5]
            comment_ids = [comment.id for comment in comments]

            # 2. 再查询当前评论中哪些评论被当前用户所点赞 ([CommentLike])
            # 查询comment_id 在第一步的评论id列表内的所有数据
            # & CommentList.user_id = g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids), CommentLike.user_id==g.user.id).all()

            # 3. 取到所有被点赞的评论id  第2步查询出来是一个 [CommentLike] 列表   比如[3,5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []

    for comment in comments:
        comment_dict = comment.to_dict()

        # 代表没有点赞
        comment_dict["is_like"] = False

        # 判断当前遍历到的评论是否被当前登录的用户所点赞
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True

        comment_dict_li.append(comment_dict)




    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li
    }
    return render_template("/news/detail.html", data=data)